What is the recommended dosing frequency for testosterone therapy?

Testosterone Dosing Frequency

You're correct that weekly dosing is a valid and often preferred option for testosterone enanthate or cypionate—the Endocrine Society guidelines explicitly recommend 75-100 mg IM weekly as an acceptable regimen, alongside the alternative of 150-200 mg every 2 weeks. 1, 2

Understanding the Dosing Options

The guidelines present both weekly and every-2-week dosing as equivalent first-line choices, selected based on patient preference, pharmacokinetics, treatment burden, and cost 1, 2. Here's the practical breakdown:

Standard Injectable Testosterone Regimens

For testosterone enanthate or cypionate:

• 75-100 mg IM weekly, OR
• 150-200 mg IM every 2 weeks 1, 2, 1

Both achieve the same goal: maintaining serum testosterone in the mid-normal range (400-700 ng/dL) 2.

Why Weekly May Actually Be Better

While every-2-week dosing remains common, weekly injections often provide more stable testosterone levels and symptom control. Here's the clinical reasoning:

Pharmacokinetic Advantages of Weekly Dosing

• Less peak-trough variation: Larger doses given every 2 weeks create significant fluctuations, with supraphysiologic peaks early and subtherapeutic troughs late in the cycle 3, 4
• Fewer cycling symptoms: Patients on every-2-week dosing may experience mood swings, acne/oily skin early, and fatigue/low libido late in the cycle 4
• Easier monitoring: Testosterone levels measured midway between weekly injections are more interpretable than the wide swings seen with biweekly dosing 1, 2
• Lower cardiovascular risk: Some evidence suggests more frequent dosing with lower individual doses may reduce cardiovascular events compared to larger, less frequent injections 3

When to Consider Even More Frequent Dosing

For patients with persistent symptom cycling, low SHBG, estradiol-related symptoms (gynecomastia, fluid retention), or hematocrit elevation on weekly dosing, consider:

• Twice-weekly injections (e.g., 50 mg twice weekly instead of 100 mg weekly)
• Every-other-day or even daily injections for maximum stability 4

The goal is dose redistribution, not dose escalation—splitting the same total weekly dose into smaller, more frequent injections 4.

Monitoring Requirements

Regardless of frequency chosen:

• Check testosterone levels at 3-6 months, then annually 2
• For weekly dosing: Measure testosterone midway between injections (3-4 days after injection)
• For every-2-week dosing: Measure midway between injections (1 week after injection)
• Target range: 400-700 ng/dL during treatment 2
• Adjust if: Testosterone >700 ng/dL or <400 ng/dL 1, 2

Monitor hematocrit at baseline, 3-6 months, then annually—if >54%, stop therapy until it normalizes, evaluate for hypoxia/sleep apnea, and restart at reduced dose 1, 2. This is particularly important because erythrocytosis occurs more frequently with injectable testosterone (15-44% depending on dose and frequency) compared to transdermal preparations 5.

Common Pitfall to Avoid

Don't default to every-2-week dosing simply out of habit. While convenient, it's not automatically superior to weekly dosing 4. Many patients report better symptom stability with weekly injections, and the evidence supports this pharmacokinetically 3, 4. The choice should be based on individual patient response, monitoring results, and tolerance—not just scheduling convenience.